Multiple periodic solutions to a class of nonautonomous second-order delay differential equation
1999 ◽
Vol 229
(2)
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pp. 659-676
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Keyword(s):
2013 ◽
Vol 254
(5)
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pp. 2158-2172
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Keyword(s):
2009 ◽
Vol 10
(5)
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pp. 3285-3297
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2008 ◽
Vol 237
(24)
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pp. 3307-3321
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2015 ◽
Vol 258
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pp. 483-488
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